Fig. 5

Rupture directivity analysis by using the linear relationship between \(T_{\text{ASD}}\) and \(\frac{\cos \varTheta }{C}\). (Lower) The \(T_{\text{ASD}}\) from azimuth of 130°–300° is analyzed to show a southward faulting (N171°E). (Upper) Similarly, a northward faulting (N17°E) is estimated from the rest of \(T_{\text{ASD}}\). Dashed lines show the best regression lines derived by a least-squares technique. The two best equations (refer to Eq. (3)) are also shown within the diagrams. The corresponding misfits as in the right of the diagrams are performed using 1° interval searching for the rupture directivity analysis